Presentation is loading. Please wait.

Presentation is loading. Please wait.

Doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Zhanji Wu, et. Al. Non-linear pre-coding MIMO scheme for next generation WLAN Date: 2013-09-14.

Published byNigel Arford Modified over 9 years ago

Similar presentations

Presentation on theme: "Doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Zhanji Wu, et. Al. Non-linear pre-coding MIMO scheme for next generation WLAN Date: 2013-09-14."— Presentation transcript:

1 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Zhanji Wu, et. Al. Non-linear pre-coding MIMO scheme for next generation WLAN Date: 2013-09-14 Authors:

2 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Zhanji Wu, et. Al. Outline This contribution provides an overview of nonlinear pre- processing MIMO for PHY in the next-generation WLAN to achieve better system performance. –preliminary simulation of linear vs. non-linear MIMO A case of 802.11ac environment was performed in the simulation. FER performance of the non-linear MIMO system were superior to that of linear MIMO.

3 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Introduction In July 2012 meeting, some requirements for next 802.11 were presented by Orange to improve the Wi-Fi experience for mobile devices[1]. Higher demand for future WLAN ： –Higher throughput and data rates. –Greater reliability. –increased number of mobile devices MIMO is one of the key technologies to improve the throughput. –TGn firstly introduce MIMO technology. –TGac include SU/MU-MIMO, and expand the number of antenna –the above standards use MIMO based on linear precoding. In order to enhance the received performance, we propose to introduce the nonlinear pre-processing as the optional pre-coding scheme for the next generation of 802.11. In this work, we take Tomlinson-Harashima Pre-coding (THP) as an example to show the advantage of nonlinear pre-coding. Zhanji Wu, et. Al.

4 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Zhanji Wu, et. Al. Non-linear precoding –Show a clear advantage over linear preequalization –Closer to the channel capacity. –Increased computational complexity Typical non-linear algorithms: –Vector perturbation (VP) [2] ; –Tomlinson Harashima precoding (THP) ： a compromise between complexity and performance. Non-linear precoding strategy

5 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Zhanji Wu, et. Al. THP Precoding Assume the channel matrix is H Because of the triangular structure of the feedback matrix B, the channel symbols, are successively generated from the data symbols, is the signal constellation. diagonal elements of S

6 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Zhanji Wu, et. Al. THP Precoding Since this strategy would increase transmit power significantly, THP modulo reduces the transmit symbols into the boundary region of A –Modulo operation :, where In other words, instead of feeding the data symbols into the linear pre- equalization, the effective data symbols are passed into B -1,which is implemented by the feedback structure in the dotted line part. The dotted line part can be described in the way of matrix, as follows

7 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Zhanji Wu, et. Al. THP Precoding We use the ZF criterion, GHFB -1 =I is required The covariance matrix of is Meanwhile, since the average total transmitted energy per symbol interval can be expressed as : Q is a unitary matrix hence is used as in [3], and the value of for different modulations can be found in [3].

8 doc.: IEEE802.11-13/1090/r2 Submission September 2013 MIMO Simulation Parameters ParametersValues Number of Antennas at TX4 Number of Antennas/Streams at RX4(SU) Number of Users (MU case)1 11ac Channel ModelD -Channel is time invariant in the packet duration. MIMO PrecodingTomlinson-Harashima precoding (THP) MIMO DecodingLinear ZF Channel Bandwidth20 MHz Channel CodingBCC, MAP Modulat typeQPSK Code rate3/4 Synchronization, Channel Est.ideal Zhanji Wu, et. Al.

9 doc.: IEEE802.11-13/1090/r2 Submission September 2013 No impairments, Sync and channel estimations are ideal SU-MIMO (4x4) Zhanji Wu, et. Al.

10 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Complexity Analysis Comparison of operation –SVD Pre-coding: SVD decomposition, matrix multiplication in transmitter and receiver. –THP Pre-coding: QR decomposition, feedback operation, matrix multiplication in transmitter and receiver, modulo operation in transmitter and receiver Comparison of complexity –Complexity of matrix decomposition and multiplication are nearly equal. –Compared to SVD Precoding, THP increases the feedback and modulo operation –The most complexity depends on the matrix decomposition. The complexity of SVD and QR are almost the same. Compared to linear pre-coding based on SVD, THP algorithm can significantly improve the system performance while introducing minor complexity overhead. Zhanji Wu, et. Al.

11 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Summary Showed simulations regarding current 11ac PHY Proposed non-linear MIMO is one of the key solutions. Performances of the nonlinear pre-coding in ac NLOS environments were better than that of linear pre-coding. Zhanji Wu, et. Al.

12 doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Reference Zhanji Wu, et. Al. [1]12/0910r0, Carrier oriented WIFI for cellular offload, Orange [2]11-12-0844-00-Non-linear Multiuser MIMO for next generation WLAN.ppt [3]R.F.H Fischer, Precoding and Signal Shaping for Digital Transmission. New York: Wiley, 2002

Download ppt "Doc.: IEEE802.11-13/1090/r2 Submission September 2013 Submission Zhanji Wu, et. Al. Non-linear pre-coding MIMO scheme for next generation WLAN Date: 2013-09-14."

Similar presentations

Doc.: IEEE 802.11-04/0015r2 Submission January 2004 Yang-Seok Choi et al., ViVATOSlide 1 Comments on Ergodic and Outage Capacity Yang-Seok Choi,

Doc.: IEEE /0015r2 Submission January 2004 Yang-Seok Choi et al., ViVATOSlide 1 Comments on Ergodic and Outage Capacity Yang-Seok Choi,
Doc.: IEEE 802.11-10/1055-00 Submission September 2010 James Wang, MediaTekSlide 1 PSMP-Based MU-MIMO Communications Date: 2010, September 14 Authors:

Doc.: IEEE / Submission September 2010 James Wang, MediaTekSlide 1 PSMP-Based MU-MIMO Communications Date: 2010, September 14 Authors:
Submission Joint Coding and Modulation Diversity with LRA MMSE VP by QR precoding MIMO Slide 1 May 2014 Ningbo Zhang, Guixia Kang and Ruyue Dong Doc.:

Submission Joint Coding and Modulation Diversity with LRA MMSE VP by QR precoding MIMO Slide 1 May 2014 Ningbo Zhang, Guixia Kang and Ruyue Dong Doc.:
Doc.: IEEE 802.11-09/1234r0 Submission November 2009 Sameer Vermani, QualcommSlide 1 Interference Cancellation for Downlink MU-MIMO Date: 2009-11-17 Authors:

Doc.: IEEE /1234r0 Submission November 2009 Sameer Vermani, QualcommSlide 1 Interference Cancellation for Downlink MU-MIMO Date: Authors:
Submission doc.: IEEE 802.11-14/1186r2 September 2014 Pengfei Xia, Interdigital CommunicationsSlide 1 Comparisons of Simultaneous Downlink Transmissions.

Submission doc.: IEEE /1186r2 September 2014 Pengfei Xia, Interdigital CommunicationsSlide 1 Comparisons of Simultaneous Downlink Transmissions.
Non-linear pre-coding for next generation WLAN

Non-linear pre-coding for next generation WLAN
VSMC MIMO: A Spectral Efficient Scheme for Cooperative Relay in Cognitive Radio Networks 1.

VSMC MIMO: A Spectral Efficient Scheme for Cooperative Relay in Cognitive Radio Networks 1.
MIMO Communication Systems

MIMO Communication Systems
Doc.: IEEE 802.11-11/0064r0 Submission Shogo Fujita, Kyushu Inst. Of Tech. Slide 1 Modulo Precoding for 11ac Date: 2011-01-17 Authors: January 2011.

Doc.: IEEE /0064r0 Submission Shogo Fujita, Kyushu Inst. Of Tech. Slide 1 Modulo Precoding for 11ac Date: Authors: January 2011.
Submission doc.: IEEE 802.11-15/0069r0 January 2015 Amichai Sanderovich, QualcommSlide 1 MIMO option for NG60 Date: 2015-01-11 Authors:

Submission doc.: IEEE /0069r0 January 2015 Amichai Sanderovich, QualcommSlide 1 MIMO option for NG60 Date: Authors:
Submission doc.: IEEE 802.11-15/ 0431 r0 March 2015 Dmitry Cherniavsky, SiBEAM, Inc.Slide 1 Shared MIMO Architecture for 802.11ay. Date: 2015-03-10 Authors:

Submission doc.: IEEE / 0431 r0 March 2015 Dmitry Cherniavsky, SiBEAM, Inc.Slide 1 Shared MIMO Architecture for ay. Date: Authors:
10 th MCM - Novi Sad, 23-24 March 2006 Joaquim Bastos ( ) 1 The information in this document is provided as is and no guarantee or warranty.

10 th MCM - Novi Sad, March 2006 Joaquim Bastos ( ) 1 The information in this document is provided as is and no guarantee or warranty.
CSI Feedback for MIMO-OFDM Transmission in IEEE aj (45 GHz)

CSI Feedback for MIMO-OFDM Transmission in IEEE aj (45 GHz)
Doc.: IEEE 802.11-09/0538r0 Submission May 2009 Eldad Perahia, Intel CorporationSlide 1 Investigation into the 802.11n Doppler Model Date: 2009-05-11 Authors:

Doc.: IEEE /0538r0 Submission May 2009 Eldad Perahia, Intel CorporationSlide 1 Investigation into the n Doppler Model Date: Authors:
Doc.: IEEE 802.11-13/1391r0 Submission Nov. 2013 Yakun Sun, et. Al.Slide 1 About SINR conversion for PHY Abstraction Date: 2013-11-11 Authors:

Doc.: IEEE /1391r0 Submission Nov Yakun Sun, et. Al.Slide 1 About SINR conversion for PHY Abstraction Date: Authors:
Submission doc.: IEEE 11-12/0844r0 Slide 1 Non-linear Multiuser MIMO for next generation WLAN Date: 2012-07-13 Authors: Shoichi Kitazawa, ATR.

Submission doc.: IEEE 11-12/0844r0 Slide 1 Non-linear Multiuser MIMO for next generation WLAN Date: Authors: Shoichi Kitazawa, ATR.
Phase Tracking During VHT-LTF

Phase Tracking During VHT-LTF
Doc.: IEEE 802.11-10/0493r1 Submission May 2010 Changsoon Choi, IHP microelectronicsSlide 1 Beamforming training for IEEE 802.11ad Date: 2010-05-17 Authors:

Doc.: IEEE /0493r1 Submission May 2010 Changsoon Choi, IHP microelectronicsSlide 1 Beamforming training for IEEE ad Date: Authors:
Doc.: IEEE 802.11-09/0161r1 Submission doc.: IEEE 802.11-10/1131r0 Sept. 2010 K. Ishihara et al.,(NTT) Slide 1 Sept. 2010 Slide 1 Time-Domain CSI Compression.

Doc.: IEEE /0161r1 Submission doc.: IEEE /1131r0 Sept K. Ishihara et al.,(NTT) Slide 1 Sept Slide 1 Time-Domain CSI Compression.
Submission doc.: IEEE 802.11-15/0627r0 May 2015 Hakan Persson, EricssonSlide 1 Beam Selection for Hybrid MIMO Precoding Date: 2015-05-10 Authors:

Submission doc.: IEEE /0627r0 May 2015 Hakan Persson, EricssonSlide 1 Beam Selection for Hybrid MIMO Precoding Date: Authors:

Similar presentations

Ads by Google